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Chicago fire investigators on Thursday were investigating a string of early morning garage fires in the Bridgeport neighborhood, including one that caused flame-licked electrical transformers to explode. (Published Thursday, April 24, 2014)

Updated at 7:35 PM CDT on Thursday, Apr 24, 2014

Chicago fire investigators on Thursday were investigating a string of early morning garage fires in the Bridgeport neighborhood, including one that caused flame-licked electrical transformers to explode.

Crews were called to three fires on the 3600 block of South Street during the 4 a.m. hour. No injuries were reported in any of those incidents and firefighters were able to quickly douse the flames.

A fire that started shortly before 6 a.m. in an alley-facing garage on the 3300 block of South Morgan Street was a little more significant. Crews from Commonwealth Edison were called in to shut down the power to the area after sparks emanated from overhead power lines and transformers.

Sky5 Above Bridgeport Fire

The fire started shortly before 6 a.m. in a alley-facing garage on the 3300 block of South Morgan Street. Mike Lorber reports from Sky5 during the NBC 5 NEWS TODAY on April 24, 2014. (Published Thursday, April 24, 2014)

Officials said a car inside the garage was on fire.

One ambulance transported a firefighter to Mercy Hospital & Medical Center but the injury was not believed to be serious.

Chicago Garages, Cars Destroyed in Overnight Fires

Chicago Fire officials say four garages were set on fire overnight in the Bridgeport neighborhood. It's not clear whether they were related. Nesita Kwan reports. (Published Thursday, April 24, 2014)

Crews were able to keep the fire away from neighboring structures and had the fire out by 6:20 a.m.

There was no confirmation from fire officials that the incidents were works of arsonists, but residents in the area said arson investigators were in the neighborhood.

Top News Photos of the Week

Published at 6:13 AM CDT on Apr 24, 2014

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